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Gaviscon Liquid Heartburn Relief Aniseed 500ml -Fast acting, soothing in just 3 minutes and lasts up to 4 hours. -Effective at treating symptoms associated with heartburn i.e. a burning pain in the chest and mild acid regurgitation. -Contains naturally derived sodium alginate which forms a protective layer over the stomach contents to help prevent acid coming back up into the oesophagus (food pipe).